使用 HttpWebRequest 下载任意类型的文件代码,CSharp代码库,德仔网

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【CSharp】使用 HttpWebRequest 下载任意类型的文件
作者:孟宪会 / 发布于2011/5/3/ 809
<div><span style="color: rgb(0,0,0)">String url </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">http://img04.taobaocdn.com/sns_album/i4/T1yAdWXgdGXXb1upjX.jpg</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">;
String fileName </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> url.Substring(url.LastIndexOf(</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">/</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">) </span><span style="color: rgb(0,0,0)">+</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">1</span><span style="color: rgb(0,0,0)">);
String refer </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> url.Substring(</span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, url.LastIndexOf(</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">/</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">) </span><span style="color: rgb(0,0,0)">+</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">1</span><span style="color: rgb(0,0,0)">);
System.Net.HttpWebRequest req </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> System.Net.HttpWebRequest.Create(url) </span><span style="color: rgb(0,0,255)">as</span><span style="color: rgb(0,0,0)"> System.Net.HttpWebRequest;
req.AllowAutoRedirect </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">true</span><span style="color: rgb(0,0,0)">;
req.Referer </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> refer;
req.UserAgent </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">;
System.Net.HttpWebResponse res </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> req.GetResponse() </span><span style="color: rgb(0,0,255)">as</span><span style="color: rgb(0,0,0)"> System.Net.HttpWebResponse;
System.IO.Stream stream </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> res.GetResponseStream();
</span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[] buffer </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">byte</span><span style="color: rgb(0,0,0)">[</span><span style="color: rgb(128,0,128)">32</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,0)">*</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">1024</span><span style="color: rgb(0,0,0)">];
</span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> bytesProcessed </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">;
System.IO.FileStream fs </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> System.IO.File.Create(Server.MapPath(fileName));
</span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> bytesRead;
</span><span style="color: rgb(0,0,255)">do</span><span style="color: rgb(0,0,0)">
{
bytesRead </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> stream.Read(buffer, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, buffer.Length);
fs.Write(buffer, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, bytesRead);
bytesProcessed </span><span style="color: rgb(0,0,0)">+=</span><span style="color: rgb(0,0,0)"> bytesRead;
}
</span><span style="color: rgb(0,0,255)">while</span><span style="color: rgb(0,0,0)"> (bytesRead </span><span style="color: rgb(0,0,0)">></span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">);
fs.Flush();
fs.Close();
res.Close();</span></div>
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　下载任意类型的文件　
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